WHERE TO FARM IT
Which area you farm is decided by the area's monster level, not by the item — the rule is the same for everything, so it lives on the mechanics page.
NAMED TARGETS
Named monsters that can be farmed deliberately. The list spans all three difficulties; each monster appears once, at its most rewarding one. The figure is an estimated average kill count.
The Cow King
normal · Lv 28
~1 every 8 kills
Coldcrow
normal · Lv 4
~1 every 10 kills
Bishibosh
normal · Lv 2
~1 every 10 kills
Bonebreaker
normal · Lv 2
~1 every 10 kills
Corpsefire
normal · Lv 1
~1 every 10 kills
The Smith
normal · Lv 10
~1 every 14 kills